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From "Billy Pearson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-728) Supporting for HLog appends
Date Thu, 21 Aug 2008 19:48:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624459#action_12624459

Billy Pearson commented on HBASE-728:

Re reading bigtable paper found this

To protect mutations from GFS latency spikes,
each tablet server actually has two log writing threads,
each writing to its own log le; only one of these two
threads is actively in use at a time. If writes to the active
log le are performing poorly, the log le writing is
switched to the other thread, and mutations that are in
the commit log queue are written by the newly active log
writing thread. Log entries contain sequence numbers
to allow the recovery process to elide duplicated entries
resulting from this log switching process.

> Supporting for HLog appends
> ---------------------------
>                 Key: HBASE-728
>                 URL: https://issues.apache.org/jira/browse/HBASE-728
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Billy Pearson
>            Assignee: Jim Kellerman
>            Priority: Blocker
>             Fix For: 0.3.0
> I thank we should open a ticket to track what needs changed to support appends when the
coding is done on HADOOP-1700.

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